//step 1, make one light light up without a button


//variables
//PINS
#define redled 8
#define blueled 12
#define btn A0 //pin that reads the button
//last time red was high
unsigned long lastTimeRedHigh = 0;  //this declaration needs to go outside the loop function. it is declared once.
//last time blue was high
unsigned long lastTimeBlueHigh = 0;
//last time blue was high
unsigned long lastTimeBlueDelayed = 0;
//red blink time
const int redBlinkTime = 2000; //changes the frequency that it blinks
//blue blink time
const int blueBlinkTime = 700; //changes the frequency that it blinks
//blue on duration time
const int blueOnDurationTime = 400; //change how long the light is on before turning off
int lastbtnstate = HIGH;

void setup() {
  //setup pins
  pinMode(redled, OUTPUT);
  pinMode(blueled, OUTPUT);
  pinMode(btn, INPUT_PULLUP);  //sets the pin to input
  Serial.begin(9600);
}

void loop() {
  int btnstate = digitalRead(btn);

  Serial.println(btnstate);


  //current time variable
  unsigned long currentTime = millis();
  if (btnstate == LOW) {
    //blink red light
    if (currentTime - lastTimeRedHigh >= redBlinkTime) { //checks if it is time to turn on the Red led
      // Serial.print(currentTime - lastTimeRedHigh);
      // Serial.print("    ");

      lastTimeRedHigh = currentTime;
      digitalWrite(redled, HIGH);
      //  Serial.print(currentTime);
      //  Serial.print("  red  ");
      //  Serial.println(lastTimeRedHigh);
    }
    else {
      digitalWrite(redled, LOW);
    }

    //blink blue light
    if (currentTime - lastTimeBlueHigh >= blueBlinkTime) { //checks if it is time to turn on the Red led
      /*
        Serial.print("blue: difference= ");
        Serial.print(currentTime - lastTimeBlueHigh);
        Serial.print(" ");
        Serial.print(" current time= ");
        Serial.print(currentTime);
        Serial.print(" last time= ");
        Serial.println(lastTimeBlueHigh);
      */
      lastTimeBlueHigh = currentTime; //increments the time
      lastTimeBlueDelayed = currentTime; //increments the time

      digitalWrite(blueled, HIGH); //turns on the blue led

    }
    else {
      if (currentTime - lastTimeBlueDelayed >= blueOnDurationTime) {
        digitalWrite(blueled, LOW); //turns off the blue led
      }
    } lastbtnstate = btnstate;

  }
  else { //if the difference is larger than the blue on duration time, then the blue led turns off
    digitalWrite(blueled, LOW);
    digitalWrite(redled, LOW);
  }
}